use sed to replace a line

I have been struggling to do this. I need to replace a line in a document with either blank space or the word "DELETED." The lines are different, and I am running a counter to determine the correct line to replace. So far, I have been using:

sed -ie ''$NUMLINE's/^$/DELETED/' Brown_Adam_CIVForms.txt 

I would like to replace the 开发者_开发知识库NUMLINE-th line from this document (whatever it may be) and replace it with either blank space or the word "DELETED." Please help!!

Thank you!!!

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Just insert .* between ^ and $. Like:

sed -ie $NUMLINE's/^.*$/DELETED/' Brown_Adam_CIVForms.txt 

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you can also use awk

awk -vnum=$NUMLINE 'NR==num{$0="DELETED"}1' file